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單項(xiàng)選擇題

Here some oil in the oily water separator, as a result of its lower （）, will separate and rise into the oil collection space.

A.temperature
B.viscosity
C.density
D.velocity

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單項(xiàng)選擇題

Heat energy is a source of power, but （） will cause damage to the engine.

A.excessive heat
B.insufficient heat
C.effective cooling
D.high output

單項(xiàng)選擇題

Head tank should be used to remove （） from cooling water.

A.scale
B.sludge
C.chemicals
D.air

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